SYSTEMATIC CATALOGUE OF SPECIES. 

 Class PELECYPODA. 



Order PRIONODESMACEA. 

 Superfamily Naiadacea. 

 Family UNIONIDtE. 



HETEROGENiE. 



Genus Truncilla Rafinesque. 



Subgenus Truncilla Rafinesque. 

 Truncilla triquetra Rafinesque ( = triangularis Lea). 



Northern Illinois (Calkins) ; Will Co. (Ferriss) ; Kankakee 

 River; Illinois River (Handwerk) ; La Salle Co. (Huett) ; 

 Wabash River (Marsh) ; Athens, Menard Co. (Nason) ; Southern 

 Illinois (Ulffers) ; Fulton Co. (Wolf). 



Subgenus Scalenaria (Rafinesque) Agassiz. 

 Truncilla sulcata Lea. 



Ohio River (Marsh). 



Subgenus Dysnomia Agassiz. 



Truncilla foliata Hildreth. 



Ohio River (Marsh) ; Southern Illinois (Ulffers). 



Subgenus Pilea Simpson. 



Truncilla perplexa Lea. 



Wabash River (Hinkley) ; Ohio River (Marsh) ; Southern 

 Illinois (Ulffers). 



Truncilla perplexa rangiana Lea. 



Illinois (Call); Wabash River (Marsh) ; Southern Illinois 

 (Ulffers). 



Truncilla propinqua Lea. 



Ohio River (Marsh). 



Truncilla per sonata Say ( = pileus Lea). 

 Southern Illinois (Ulffers). 



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